Remove unused import

Author: Susurrus

test/sys/test_termios.rs

@@ -4,7 +4,7 @@ use nix::{Error, fcntl, unistd};
 use nix::errno::Errno;
 use nix::pty::openpty;
 use nix::sys::termios::{self, ECHO, OPOST, OCRNL, Termios, tcgetattr};
-use nix::unistd::{read, write, close};
+use nix::unistd::{read, write};
 
 /// Helper function analogous to std::io::Write::write_all, but for `RawFd`s
 fn write_all(f: RawFd, buf: &[u8]) {